Apparatus for cooling sewing machine needles



A. J. GIGLIO 2,45Z3fi2 APPARATUS FOR COOLING SEWING MACHINE NEEDLES Dec, 2%, 1%48 Filed Dec. 22, 1944 Patented Dec. 28, 1948 UNITED STATES PATENT APPARATUS FOR COOLING SEWING- MACHINE NEEDLES Antonio J. Giglio, Providence, R. 1., assignor to Premier Thread Company, a corporation of Rhode- Island Application December 22, 1944, Serial No. 569,322

This invention relates to a sewing machine and requires the machine to be equipped with a plu-v rality of needles, such an arrangement cannot be satisfactorily used to uniformly apply coolant in amounts required directly onto all the needles.

One of the objects of this invention is to pro-, vide for the uniform application of coolant to a single or a plurality of needles.

Another object of the invention is to position the coolant conduit at such a location that the same may be tapped to provide additional dis-, charge openings directly opposite additional needles which may be added to the machine.

Another object of the invention is to provide for supplying the coolant at a pressure of a constant value.

Another object of the invention is to provide for supplying a coolant to each of a plurality of sewing machines from a common source at a constant pressure.

Another object of the invention is to provide for the control of the amount of coolant discharged onto the needle or needles of each of sev eral machines in accordance with the individual requirements of the work acted upon by each machine.

Another object of the invention is to provide liquid coolant in uniform amounts onto each of a plurality of needles carried by a common needle bar.

With these and other obj ects in view, the invention consists of certain novel features of construction, as will be more fully describedand particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is an elevational view of a sewingmachine embodying my invention and showing diagrammatically an electric circuit to a driving motor;

Fig. 2 is a view in perspective showing the presser foot of the machine with a part of the coolant conduit attached thereto and with the needle in a raised position relative to the presser foot;

Fig. 3 is a sectional view taken along a line extending substantially centrally and lengthwise through "the presser foot shown in Fig. 2;

3 Claims. (01. 112 21s) Fig. 4 is a view in perspective similar to thatshown in Fig. 2 but illustrating two needles in their raised positions relative to the coolant noz-' zle and presser foot; and

Fig. 5 is a view partially in section I what diagrammatically showing a coolant supply source with an arrangement for maintaining the coolant at a substantially constant lev'eland: a main conduit leading therefrom through which the coolant is supplied to a plurality of sewing:

machine stations. I

Referring to the drawing for a more detailed description of the invention, the numeral Ill destor (not shown) but diagrammatically indicated at l3 in its electric circuit. A standard l5 ro-m tatably receives a thread supply It; The thread is led from this supply to the usual tension de-2 vices I6, I1, guide l8, feed bar l9, guide 20 and from there to the eye of the needle 2 I. A presser foot 22 is secured to a vertically movable bar in the head and is provided'with a slottedopening 23 through which the needle or needles of the machine pass.

In accordance with the invention I provide aconduit having a rigid portion 24 for discharging a liquid coolant directly onto the needle.

stantially into an L-shape providing a straight leg .25 which is closed at one end as at 26. This leg 25 is attached to the lower part 21 of the presser foot adjacent to the edge of the opening 23 and in position to extend laterally across the. presser foot adjacent to the path of travel of the needle. The straight leg 25 is provided'with an opening 28 positioned in line with the needle and through which coolant is discharged laterally. of the conduit directly onto the needle. Should the machine be equipped with a plurality of.

needles, as shown in Fig. 4, then a plurality of openings, one opening for each needle, will be provided. Should additional needles be added to a machine initially provided with a conduit having a single opening, then it will be merely necessary to tap the conduit at appropriate locations to provide the necessary additional openings 28, one for each additional needle. In the event of a change in the number of needles to an amount less than the initial number of discharge openings provided in the conduit then the unused open- OFFICE-1;

and some- This rigid portion 24 is of tubular formation bent'sube ings may be temporarily plugged with a small pointed dowel which may be whittled from a match stick or the like.

A reservoir 30 is provided for the liquid coolant. This reservoir is positioned sufliciently above the sewing machine presser foot to develop the necessary head or pressure to feed the "coolant through the conduit. When several sewing machines are to be supplied with coolant from the reservoir, a main conduit 3i may lead from the reservoir to the various stations for the several machines, each presser foot of which should be at the same level. In this conduit 3| threaded openings are provided for threadingly receiving" 1 In order to control the amount of coolant pass-L ingthroughthe outlet 34, the discharge opening in the valve is controlled by a needle valve having astem 39 which is rotatable to increase or decrease the size of the discharge opening in a manner well known in the valve art. From each valve there extends a flexible tubing 40, the end portion-of which receives the end portion of the rigid conduit part 24, thus completing the conduit of liquid from the valve to the presser foot.

The flow'of coolant through the valve occurs only at such times as the machine is in motion. The handle 36 is'connected to the treadle 41 by means of a flexible connector 42 attached at one end'to the treadle and at the other end to a pull spring 43 depending from the handle 36. As the treadle is depressed to move the switch 44 of the 7 electric motor l3 to closed position; the handle 36 will be moved to rotate the valve stem 35 to open position to permit the flow of coolant through the valve, When the treadle is released to permit opening of the switch 44, a pull spring conveniently anchored at one end above the handle as at 48 and attached at the other end to the handle, will move the handle to closed position against the stop 38 and arrest the flow of coolant through'the valve.

Itis desirable that the flow of coolant shall be under pressure of a constant value and accordinglyI provide for the maintaining of a constant level of coolant in the reservoir. This I accomplish by providing a valve device 41 into which pens the supp p 4 discharge spout 49 which extends adjacent to the bottom of the reservoir. A ball floatlill has its stem ,5! pivotally connected to a bracket 52 car.- r i'ed by the valve casing. The stem 51 has an enlar ement 53 which contacts the end of the valve closure. member 54. When the coolant in th reservoir is at the predetermined level the relationship between the enlargement .53 and Stem 5'! is such that the valve is closed to the flow or coolant therethroush .As the. level of This valve 41 has a the coolant in the reservoir lowers through the use thereof the float 50 will lower and depress the closure member 54 to move the same to open the valve to the flow of coolant therethrough toreplenish the used coolant. When the predetermined level of the coolant has again been reached the raising of the float 50 -:wi1l permit-the :closure member 54 to be returned to closed position and stop the flow of coolant through the valve.

It will be apparent that the arrangement of coolant feed herein disclosed is suitable for use with a single machine or with a plurality of machines. When used with a plurality of machines the flow and amount of coolant to each machine is controlled in accordance with the individual requirement of the work performed on each machine.

I claim:

1. In a sewing machine, a reciprocating needle, a presser foot, a conduit for conducting liquid coolant to said needle having a portion thereof extending laterally across said presser foot and foot and attached thereto at a location adjacent the path of movement of said needles, said portion comprising a tubular member having anopening for each of said needles, each of said openings facing said needles for the discharge of coolant onto said needles.

3. In combination, a plurality of'sewing machines, each having a reciprocating needle and" a presser foot at a common level, a common'liquid coolant reservoir positioned at alocation above said level, a main conduit from said reservoir,

individual conduits from the main conduit exftending to each presser foot and opening at a location facing said needle andadjacentthereto, said coolant flowing by gravity through said conduit under pressure maintained substantially at a constant value and a valve in each individual conduit forregulating the amount'of the-flow of coolant through each individual conduit.

ANTONIO J. .GIGLIO.

REFERENCES CITED The following references are of record in the file of this patent: i

UNITED STATES PATENTS Number Name Date 197,575 Theine Nov. 27, 1877 760,439. Erbor May 24, 1904 877,556 Eaton Jan. 28, 1908 1,057,099 Stanbow Mar. 25, 1913 2,316,647 Giglio Apr. 13, .1943 2,316,648

Giglio Apr. 13, 1913 

